Hello student,

Candidates must have completed 12 th standard or equivalent exam from a recognised Board for Indian Army and Physics and Mathematics is compulsory subjects for Indian Air Force and Naval. Candidates between 16 years to 19 years are eligible for NDA.

It is advised to start preparation now itself, so that last moment hurry and rush is avoided. Also, you'll get good amount of time to study peacefully for NDA exam. But make sure that you meet the eligibility criteria while you appear for exam.

As you are in 11 th standard, you might write NDA exam next year if you meet the age criteria and education qualification.

For NDA 2 - 2023, candidates must have born not earlier than January 2, 2005, and not later than January 1, 2008.

For NDA 1, candidates should be born not earlier than July 2, 2004 and not later than July 1, 2007.

Candidates must be unmarried and belong to Indian Nationality.

For more information go through below mentioned link.

https://competition.careers360.com/articles/nda-eligibility-criteria

Hope this information was helpful to you.

Best of Luck!!